二甲基亚砜添加剂对聚合物太阳能电池性能的影响

研究了二甲基亚砜(DMSO)掺杂浓度对基于聚(3-己基噻吩)(P3HT)和(6,6)-苯基碳60丁酸甲酯(PCBM)为有源层的聚合物太阳能电池性能影响。结果表明,掺杂 DMSO 可以提高聚合物太阳能电池短路电流密度和填充因子。DMSO掺杂质量比为3%时,电池短路电流密度提高到7.88 mA·cm-2,填充因子为55.5%。能量转换效率达到2.54%,相比没有掺杂 DMSO 的电池,能量转换效率提高了17%。傅里叶变换红外光谱被用于鉴定和分析掺杂DMSO对材料P3 HT∶PCBM化学性质的影响。傅里叶变换红外光谱表明,掺杂后P3 HT和PCBM的化学性质都没有改变。为分析掺杂DMSO改善器件能量转换效率的原因,通过紫外-可见光谱和电流密度-电压特性曲线分别表征器件的光吸收能力以及电致发光器件的载流子迁移率。与P3 HT∶PCBM薄膜相比,P3 HT∶PCBM∶DMSO薄膜在可见光范围内的吸收峰有明显红移且吸收强度增强。可见光吸收的改善是实现短路电流密度提高的有力保障。太阳能电池性能的增强是因为 DMSO 的掺杂提高了P3 HT∶PCBM的载流子迁移率和吸收光谱宽度。

Influence of Dimethyl Sulfoxide as Processing Additive for Improving Efficiency of Polymer Solar Cells

The effect of dimethyl sulfoxide (DMSO)doping concentration on the performance of polymer solar cells (PSCs)based on poly(3-hexylthiophene)(P3HT)∶(6,6)-phenyl C60 butyric acid methyl ester (PCBM) as the active layer was investigated.The results suggest that the doping of DMSO can improve short-circuit current density (Jsc)and fill factor (FF)of the PSCs.The cell with 3% DMSO exhibits enhanced Jsc(7.88 mA·cm-2 ),and FF (55.5%).The optimized power conversion efficiency (PCE)arrived to 2.54%,which is 1 7% higher than that of the cell without DMSO doping.The Fourier Transform infrared spectroscopy (FT-IR)is used to demonstrate the effect of DMSO doping into P3 HT∶PCBM on chemical properties.The pres-ence of FTIR suggests that the chemical properties of P3 HT and PCBM have no changes.To investigate the causes of the PCE improvement after addition of DMSO,an enhanced light harvesting and charge carriers transport properties of electroluminescence devices were observed by UV-Visible spectra and J-V characteris-tics.The absorption peaks of P3 HT∶PCBM∶DMSO thin film show a distinguished red shift and strong ab-sorption compared to P3 HT∶PCBM thin films in the visible light range.It was considered that the increase of the Jsc was supported by this phenomenon of UV-Visible absorption.The charge carrier mobility change of the P3 HT∶DMSO films is studied by employing the donor-only devices.The increased performance should be at-tributed to the enhanced charge carrier mobility and widened absorption spectra of P3 HT∶PCBM through do-ping DMSO.